Surname Тандилян (Тандилян 
, Tandilian 
) , globally, is a rare family name. The surname Тандилян is characteristic of Belarus, where it is a rare surname, Russia, where it is a very rare surname, and China, where it is an extremely rare surname. Likewise, Тандилян is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Тандилян | Belarus, Russia, Armenia |
| Tandilian | China |